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    Re: Need help writing a slope-fit excel sheet
    From: Stan K
    Date: 2014 Jan 25, 07:20 -0500
    Greg,

    Even though it might not answer your specific question, there is a massive spreadsheet that includes sight averaging that you might be interested in checking out.  It is available at

    http://www.calmseas.org/boating_links/boating_links.html

    It is under "Education" and is called "Celestial Navigator".  Its User Guide is also there.

    Celestial Tools also includes a sight averaging function, but the way it selects outliers is crude compared to a graph.

    Stan


    -----Original Message-----
    From: Greg Licfi <cfi{at}licfi.com>
    To: slk1000 <slk1000---.com>
    Sent: Fri, Jan 24, 2014 8:02 pm
    Subject: [NavList] Need help writing a slope-fit excel sheet


    Hi all,
          I read a article by David Burch concerning sight averaging with (I
    believe) the intent on improving
    the sights taken with plastic sextants. Mr. Burch believes that this
    technique should be applied to metal
    sextants to improve overall accuracy. One of the things he suggested is
    doing a slope-fit of the multiple
    sight data to kick out not-so-obviously-bad data points. It all makes
    sense to me. I started to write a slope-fit
    excel sheet (which eventually I can use on my smart phone) There are two
    plots: one is the sight data
    in BLUE, the second is a Hc for the start & stop times of the sights it
    is in RED. ultimately you will be able to
    slide the RED Hc plot up or down to see if the sight data points fit the
    slope. I'm stuck getting the buttons
    to work. I would ask if there are any excel mavens on the list if they
    could look at my attached sheet and
    help me activate the cursor up/down buttons; I'm not super knowledgeable
    on macros. Once that is figured
    out it should be quite handy for isolating bad sights.
    Many Thanks In Advance!
    ~Greg
    
    P.S.
    Typically how many sights on average should one take, and over what time
    span?
    
    
    
    
    Attached File:

    (img/126689.slope fit.xls: Open and save or View online)

    View and reply to this message: http://fer3.com/arc/m2.aspx?i=126689
       
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